Seoul, South Korea - app. 10,321,449

The capital of South Korea and once the ancient capital of the Baekje Kingdom (18 B.C. - 660 A.D.), Seoul literally means "capital" in Korean.

Metropolitan Seoul, with approximately 20.7 million people, is the world's fourth largest urban center, just behind Tokyo-Yokohama, Mexico City and Sao Paulo.

Founded in 1394 as the capital of the Kingdom of Choson, contemporary Seoul is the site of Caribbean Bay, the world's largest water park, which opened in 1996. It set a record for water park attendance, as more than 1.5 million people visited it within its first two years of inception.